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1 //===--- SimpleFormatContext.h ----------------------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 /// \file
11 ///
12 /// \brief Defines a utility class for use of clang-format in libclang
13 //
14 //===----------------------------------------------------------------------===//
15
16 #ifndef LLVM_CLANG_SIMPLE_FORM_CONTEXT_H
17 #define LLVM_CLANG_SIMPLE_FORM_CONTEXT_H
18
19 #include "clang/Basic/Diagnostic.h"
20 #include "clang/Basic/DiagnosticOptions.h"
21 #include "clang/Basic/FileManager.h"
22 #include "clang/Basic/LangOptions.h"
23 #include "clang/Basic/SourceManager.h"
24 #include "clang/Rewrite/Core/Rewriter.h"
25 #include "llvm/Support/FileSystem.h"
26 #include "llvm/Support/Path.h"
27 #include "llvm/Support/raw_ostream.h"
28
29 namespace clang {
30 namespace index {
31
32 /// \brief A small class to be used by libclang clients to format
33 /// a declaration string in memory. This object is instantiated once
34 /// and used each time a formatting is needed.
35 class SimpleFormatContext {
36 public:
37   SimpleFormatContext(LangOptions Options)
38       : DiagOpts(new DiagnosticOptions()),
39         Diagnostics(new DiagnosticsEngine(new DiagnosticIDs,
40                                           DiagOpts.getPtr())),
41         Files((FileSystemOptions())),
42         Sources(*Diagnostics, Files),
43         Rewrite(Sources, Options) {
44     Diagnostics->setClient(new IgnoringDiagConsumer, true);
45   }
46
47   ~SimpleFormatContext() { }
48
49   FileID createInMemoryFile(StringRef Name, StringRef Content) {
50     const llvm::MemoryBuffer *Source =
51         llvm::MemoryBuffer::getMemBuffer(Content);
52     const FileEntry *Entry =
53         Files.getVirtualFile(Name, Source->getBufferSize(), 0);
54     Sources.overrideFileContents(Entry, Source, true);
55     assert(Entry != NULL);
56     return Sources.createFileID(Entry, SourceLocation(), SrcMgr::C_User);
57   }
58
59   std::string getRewrittenText(FileID ID) {
60     std::string Result;
61     llvm::raw_string_ostream OS(Result);
62     Rewrite.getEditBuffer(ID).write(OS);
63     OS.flush();
64     return Result;
65   }
66
67   IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts;
68   IntrusiveRefCntPtr<DiagnosticsEngine> Diagnostics;
69   FileManager Files;
70   SourceManager Sources;
71   Rewriter Rewrite;
72 };
73
74 } // end namespace index
75 } // end namespace clang
76
77 #endif